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A base layer is typically required when installing artificial grass, and the specific materials depend on the surface where the turf is being placed.

If you are installing artificial grass over soil, you should lay down a sub-base and a weed barrier.

• Weed Barrier: A fabric weed barrier, weed membrane, or geo-textile paper is essential to prevent weeds from growing through and damaging the turf.

• Sub-base: This layer provides drainage, support, and prevents the turf from sinking. Common materials include a mixture of gravel and sand, such as crushed miscellaneous base (CMB), decomposed granite, decomposed limestone, or a specifically mixed road base. Other options include silica sand and granite sand.

If you are placing turf over a hard surface like concrete, you can often skip the sub-base and use a padded underlayment or shock-absorbent material like astro-cushion for comfort and safety.

If you are unsure which materials are best for your specific project, it's a good idea to consult with an artificial turf installer.

While you don’t need to put anything down before mulch, you can apply a pre-emergent herbicide to prevent weed growth. As long as you remove weeds before you spread mulch, you should be in the clear. But a herbicide is something that you can put down before mulch as an extra layer of protection.

Topsoil should go down first. If the topsoil is next to your house, make sure the grade slopes away from the house to keep water from pooling against your foundation and possibly leaking into your basement or crawl space. Don’t cover your decorative landscape mulch with topsoil as that defeats the purpose of laying down the mulch. If you’re trying to create a certain soil composition to improve plant growth, you’ll likely want compost mixed into the topsoil instead of mulch. Over time, any decorative wood mulch will simply decompose under the topsoil.

Weeds can grow through rubber mulch, but it depends on if you removed all the weeds in your garden beforehand. Weeds already in the soil can grow even when using rubber mulch. However, that doesn’t mean that your garden will be littered with rubber and weeds, but it does mean that the occasional weed might still pop up. Another way you can increase your weed suppression is by using landscape fabric as a second layer.